Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Converting sound level measurements in dbA to db 1
- Thread starter DHZ
- Start date
-
1
- #2
DHZ-<br>
<br>
You already have a measurement in dB. <br>
<br>
The notation you have denotes a difference in dB from a reference level. The particular reference level is conveyed by the notation: dBA. <br>
<br>
If you were to have an loss in your system, say a curtain that absorbed 30 dB of sound, you could subtract that directly from your source level in dBA to get a received level in dBA. This way, you can create a 'link budget', which accounts for all losses and gains in a system to determine your final signal level. This would still be referenced to the orignial level, in this case the 40 phon weighting curve.<br>
<br>
The 40 phon weighting curve, is a tough one. The exact energy level varies according to the particular frequency measured. It becomes very complex when a variety of time-varying frequencies, such as are found in speech, are measured at the same time. <br>
<br>
Also note that the proper notation is "dB". The "B" refered to is Alexander Graham Bell. Since it is a proper name, it should be capitalized. You may need to turn off the capitalization checker of your spell check (or put up with it), to write good memos.<br>
<br>
-Joe
<br>
You already have a measurement in dB. <br>
<br>
The notation you have denotes a difference in dB from a reference level. The particular reference level is conveyed by the notation: dBA. <br>
<br>
If you were to have an loss in your system, say a curtain that absorbed 30 dB of sound, you could subtract that directly from your source level in dBA to get a received level in dBA. This way, you can create a 'link budget', which accounts for all losses and gains in a system to determine your final signal level. This would still be referenced to the orignial level, in this case the 40 phon weighting curve.<br>
<br>
The 40 phon weighting curve, is a tough one. The exact energy level varies according to the particular frequency measured. It becomes very complex when a variety of time-varying frequencies, such as are found in speech, are measured at the same time. <br>
<br>
Also note that the proper notation is "dB". The "B" refered to is Alexander Graham Bell. Since it is a proper name, it should be capitalized. You may need to turn off the capitalization checker of your spell check (or put up with it), to write good memos.<br>
<br>
-Joe
- Status
Similar threads
- Locked
- Question
- Locked
- Question
- Locked
- Question